Conceptual Physics (12th Edition)

by
Hewitt, Paul G.

Published by
Addison-Wesley

ISBN 10:
0321909100

ISBN 13:
978-0-32190-910-7

Chapter 5 - Think and Discuss: 74

Answer

There are three action-reaction forces.
1. Action: foot exerts force on ball. Reaction: ball exerts force on foot.
2. Action: Earth pulls down on ball. Reaction: ball pulls up on the Earth.
3. Action: support force from floor pushes ball upward. Reaction: ball pushes floor downward.
The action force in each action-reaction pair has the same magnitude as the reaction force and the two are oppositely directed, according to Newton’s third law.